JPS6342010Y2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a front wheel mounting device for a tractor that uses a common front axle bracket and can freely replace the front axle with one with forcedly driven wheels and one with wheels that are not forcedly driven.

In this type of tractor, if the center pin of the front axle for front wheel drive and the center pin of the front axle for non-front wheel drive are alternatively attached to different positions on the front axle bracket, the unused center pin on the bracket It is necessary to attach a protective cover to the mounting seat on the front axle, and there is a problem in that it takes time and effort to remove and install the protective cover when replacing the front axle. Furthermore, providing a protective cover and two sets of mounting seats on the front axle bracket itself complicates the structure and increases costs.

In order to solve the above problem, the present invention is designed to selectively attach a center pin support for a front axle that is not for front wheel drive and a center pin support for front wheel drive to a common mounting seat of the front axle bracket. , will now be explained with reference to the drawings.

FIG. 1 is a vertical left side view of the front axle portion of an agricultural tractor to which the present invention is applied, which is not for front wheel drive.
It has a downward-opening gate shape having a rear leg section 3 and a rear leg section 3, and the rear leg section 3 and its upper part are fixed to the front end of the engine 5 with a plurality of bolts 4. Center pin supports 9 and 10 are fastened to both leg portions 2 and 3 with a plurality of bolts 6 and 7, as will be described later. The front end of a center pin 12 extending from front to back (left and right in FIG. 1) in the center of the vehicle body fits into the hole 11 of the support 9 on the front side (left side in the figure) via a short bush 13. A rectangular outward flange 14 (see FIG. 2) is fastened to the front surface of the front leg 2 by a plurality of bolts 15. The rear end of the center pin 12 is directly fitted into the hole 16 of the rear center pin support 10. A sleeve 17 is rotatably fitted into a portion of the center pin 12 between the bush 13 and the rear support 10, and the sleeve 17 is fixed to the front axle 19. Reference numeral 20 denotes an extension fixed to the front axle 19, which holds a king pin support tube 21 at the side end of the vehicle body. 22 is a knuckle arm, and 23 is a bumper.

FIG. 2 is a partial front view including a vertical section, and as shown in FIG.
(Fig. 1), a pair of horizontal flanges 24, 2 are formed toward the sides of the vehicle body.
5 (only the left part or right part shown) protrudes,
Each pair of flanges 24 and 25 is a lower end surface 2 of the fork-shaped front leg portion 2 or rear leg portion 3, respectively, when viewed from the front.
6 and 27 with a plurality of bolts 6 and 7.

Next, the case where a front axle for front wheel drive is attached will be explained. In FIG. 3, which is a partially cutaway left side view, 30 is a front axle for front wheel drive, and the center box 31 of the axle 30 is
is supported by a pair of front and rear center pin supports 32 and 33, as will be described later. The front center pin support 32 has a pair of horizontal flanges 34 that protrude toward the sides of the vehicle body, as shown in FIG. 4, which is a front view including a partial vertical section. It is fastened to the lower end surface 26 of the section 2. Similarly to the support 32, the center pin support 33 on the rear side of FIG. has been done. As is clear from these descriptions, the lower end surfaces 26, 27 of both legs 2, 3 are used as mounting seats for supports 32, 33 for front wheel drive and for supports 9, 10 (FIG. 1) not for front wheel drive. In order to enable dual use, the dimensions and shape of the fastening surfaces (the upper surfaces of flanges 34, 35 and 24, 25) of the two sets of supports 32, 33 and 9, 10, as well as bolt holes and positioning. Pin 36 (5th
The dimensional positions of the holes in Figure) correspond to each other.

As shown in FIG. 5, which is a partial cross-sectional view of FIG. 38 and an oil seal 39, the pin 42
The front half of the pin 42 is fitted into the hole 43 of the center pin support 32, and a hexagonal outward flange 44 (FIG. 4) at the front end of the pin 42 is fixed to the support 32 with six bolts 45. An outward flange 49 of a cylindrical center pin 47 is fixed to the rear end surface of the rear cylindrical portion 46 with a plurality of bolts 50, and the outer peripheral surface of the portion of the pin 47 rearward from the flange 49 is provided with a bush 51 and an O-ring 52. It is rotatably fitted into the hole 53 of the center pin support 33 via the center pin support 33 . An annular plate 57 to which a case 56 of a pinion shaft 55 is welded is fixed to the rear end surface of the support 33 by bolts 59. 6
0 and 61 are bearings, 62 is an oil seal, and 63 is a spacer.

To replace the front axle, for example, the bolts 6 and 7 shown in FIG. 1 are removed, the center pin supports 9 and 10 are removed from both legs 2 and 3, and together with the supports 9 and 10, the pin 12, axle 19, etc. are removed. Next, as shown in FIG. 3, the front axle 30 is placed in a predetermined position, and the horizontal flanges 34, 35 of both supports 32, 33 are fastened to the lower end surfaces 26, 27 of the legs using the bolts 6, 7 that were previously removed. This completes the replacement work.

When the left and right front wheels pass through a place with a difference in height,
The front axle 19 in FIG. 2 tries to swing, for example, in the direction of arrow A, and in that case, a relative rotation occurs between the sleeve 17 and the center pin 12 in FIG. 1, allowing the axle 19 to swing. . Also, the front axle 30 in Fig. 4 is indicated by arrow A.
When attempting to swing in this direction, sliding occurs at the bushes 38 and 51 in FIG. 5, allowing the swing.

As explained above, according to the present invention, the center pin supports 9, 10 not for front wheel drive and the center pin supports 32, 33 for front wheel drive are selectively attached to a common mounting seat (lower end surfaces 26, 27). so that both center pin supports 9,
10 and 32, 33 are supported by the common mounting seats 26, 27, the lower end surfaces 26, 27 are always protected by either one of the sets of supports 9, 10 or 32, 33, and the lower end surfaces 26, 27 are provided with dedicated There is no need to provide a protective cover. Therefore, when replacing the front axles 19, 30, it is not necessary to remove and attach the protective cover, and the axle replacement work can be performed simply and easily. Since a protective cover is not required and only one set of mounting seats needs to be provided on the front axle bracket 1, the structure is simplified and costs can be reduced.

In addition, when embodying this invention, not only should the mounting seat on the axle bracket 1 side be made common,
Center pin support not for front wheel drive 9,10
It is also possible to make the front wheel drive center pin supports 32, 33 the same size and shape, that is, to use only one type of center pin support, in which case to replace the front axles 19, 30, The center pins 12, 42, 47 are removed and attached to the center pin support.

[Brief explanation of the drawing]

Fig. 1 is a vertical left side view of a front axle part not for front wheel drive, Fig. 2 is a partial front view including a partial vertical section of the embodiment of Fig. 1, and Fig. 3 is a part of a front axle part for front wheel drive. Cutaway left side view,
FIG. 4 is a front partial view including a partial vertical section of the embodiment shown in FIG. 3, and FIG. 1...Front axle bracket, 2...Front leg, 3...Rear leg, 5...Engine, 9,1
0, 32, 33... Center pin support, 1
9,30...Front axle, 26,27...
Lower end surface.

Claims (1)

[Scope of utility model registration request] The rear leg of the front axle bracket, which is gate-shaped when viewed from the side, is fixed to the front end of the engine, and bolt holes are provided in the lower end surfaces of the front and rear legs of the bracket, and holes for center pin support are provided in the lower end surfaces of the front and rear legs. A mounting seat is formed, and the center pin support of the front axle not for front wheel drive and the center pin support of the front axle for front wheel drive can be fastened to the common mounting seat so that the center pin support of the front axle for front wheel drive can be fastened to the common mounting seat. A tractor characterized in that the size and shape of the mounting surface and the positional dimensions of the bolt holes correspond to the size and shape of the common mounting seat and the positional dimensions of the bolt holes, and both of the center pin supports are supported by the common mounting seat. Front wheel mounting device.